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Joo, Munkyu,Shin, Jihye,Kim, Jiyeon,You, Jae Bem,Yoo, Youngmin,Kwak, Moo Jin,Oh, Myung Seok,Im, Sung Gap American Chemical Society 2017 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.139 No.6
<P>In spite of the huge research interest, ionic polymers could not have been synthesized in the vapor phase because the monomers of ionic polymers contain nonvolatile ionic salts, preventing the monomers from vaporization. Here, we suggest a new, one-step synthetic pathway to form a series of cross-linked ionic polymers (CIPs) in the vapor phase via initiated chemical vapor deposition (iCVD). 2(Dimethylamino) ethyl methacrylate (DMAEMA) and 4-vinylbenzyl chloride (VBC) monomers are introduced into the iCVD reactor in the vapor phase to form a copolymer film. Simultaneously in the course of the deposition process, the tertiary amine in DMAEMA and benzylic chloride in VBC undergo a Menshutkin nucleophilic substitution reaction to form an ionic ammonium chloride,complex, forming a highly cross linked ionic copolymer film of p(DMAEMA-co-VBC). To the best of our knowledge, this is the first report on the synthesis of CIP films in the vapor phase. The newly developed CIP thin film is further applied to the surface modification of the membrane for oil/water separation. With the hydrophilic and underwater oleophobic membrane whose surface is modified with the CIP film, excellent separation efficiency (>99%) and unprecedentedly high permeation flux (average 2.32 X 10(5) L m(-2) h(-1)) are achieved.</P>
Thermally Fast-Curable, “Sticky” Nanoadhesive for Strong Adhesion on Arbitrary Substrates
Joo, Munkyu,Kwak, Moo Jin,Moon, Heeyeon,Lee, Eunjung,Choi, Siyoung Q.,Im, Sung Gap American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.46
<P>Demand of adhesives that are strong but ultrathin with high flexibility, optical transparency, and longterm stability has been rapidly growing recently. Here, we suggest a thermally curable, 'sticky' nanoadhesive with outstanding adhesion strength accomplished by single-side deposition of the nanoadhesive on arbitrary substrates. The sticky nanoadhesive is composed of an ionic copolymer film generated from two acrylate monomers with tertiary amine and alkyl halide functionalities, formed by a solvent-free method, initiated chemical vapor deposition (iCVD). Because of the low glass transition temperature (T-g) of the copolymer (-9 degrees C), the ionic copolymer shows a viscoelastic behavior that makes the adhesive attachable to various substrates, regardless of the substrate materials. Moreover, the copolymer film is thermally curable via a cross-linking reaction between the alkyl halide and tertiary amine functionalities, which substantially increased the adhesion strength of the 500 nm thick nanoadhesive greater than 25 N/25 mm within 5 min of curing at 120 degrees C. The adhesive thickness can further be reduced to 50 nm to achieve greater than 35 N/25 mm within 30 min at 120 degrees C. The nanoadhesive layer can form uniform adhesion in a large area substrate (up to 130 x 100 mm(2)) with the deposition of the adhesive only on one side of the substrates to be laminated. Because of its ultrathin nature, the nanoadhesive is also optically transparent as well as highly flexible, which will play a critical role in fabrication and the lamination of future flexible/wearable devices.</P>
LCD 제조공정에서의 폐용매 분리처리를 위한 공정 설계
윤문규(Munkyu Yoon),이문용(Moonyong Lee) 한국청정기술학회 2008 청정기술 Vol.14 No.4
연구에서는 LCD 제조 공정에서 배출되는 스트리퍼와 디벨로퍼 혼합 폐액(SD폐액)과 스트리퍼 폐수의 효과적 분리 및 처리를 위한 가능한 기술로서 추출공정과 증류공정의 기술적/경제적 타당성을 검토하였다. SD 폐액과 스트리퍼 폐수의 추출분리를 위한 용매로 CHCl₃가 여러 가지 관점에서 가장 적절한 용매로 확인되었다. 또한 SD폐액 분리 회수를 위한 공정으로서 추출공정과 증류공정의 두 가지 공정에 대하여 정밀 전산 모사를 수행한 결과 CHCl₃를 이용한 추출분리공정이 단순종류공정보다 6배 정도 에너지 소요비용이 적게 소요됨을 확인할 수 있었다. In this study, we carry out economic and technical feasibility study for treatment process of waste solvent such as SD waste solution and stripper solution from LCD manufacturing process. Extensive screening work has been done for selecting the best extraction solvent. As a result, it is shown that CHCl₃ is the most adequate extraction solvent for separation and recovery of both SD waste solvent and stripper waste. Rigorous simulation study has been carried out for extraction process and distillation process as a candidate of waste solvent treatment. The result shows that the solvent extraction process is more beneficial than the simple distillation process.
Shadow Mask GRS 공정에서의 반응수율 향상을 위한 기술개발
윤문규(Munkyu Yoon),구기갑(Kee-Kahb Koo),이문용(Moonyong Lee) 한국청정기술학회 2007 청정기술 Vol.13 No.3
급속한 성장에 따른 디스플레이 산업에서의 생산량 증가는 원료 사용의 증가와 배출액의 증가를 야기하고 있으며 이에 따른 폐액 처리양이 증가되어 환경적, 경제적 문제점을 안고 있다. 본 연구에서는 브라운관 소재인 shadow mask의 식각공정 시 사용한 식각용액의 피로도를 감수시키기 위하여 산화반응을 이용하여 신액 사용량과 구액 배출량을 최소화해주는 GRS(Green Recycling System)공정의 수율을 향상시키기 위해 실험실 및 현장적용 실험을 통하여 공정의 최적화를 하기위한 방법을 연구하였다. 공정변수들과 GRS 공정의 수율과의 관계를 규명하였으며 GRS 반응기의 내부구조 개선으로 인해 약 10%의 수율증가를 확인하였으며 공정의 수율 향상과 최적화에 큰 도움이 되었다. In the present study, we developed a methodology to minimize a waste solution produced in the etching process. The condition for the optimization of the GRS process was studied on the basis of laboratory experiment and field test as well as pilot test. Through the study, we analyse the relation of the main process variables and the yield of the GRS process. The application of the new operation condition and the reactor internal modification results in 10% yield improvement in the GRS process and accordingly decreases a wasted solution.
LNG 예냉을 이용한 0.5 TPD 수소 액화 공정 해석
윤문규(Munkyu Yun),이춘식(Chunsik Lee),임동렬(Dong-Ryul Rhim),염충섭(Choongsub Yeom) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
High density liquefied hydrogen could be stored safely, transported for long distances, and used as fuel for fuel cell vehicles, hydrogen propulsion ships, and space shuttles. Precooling for the hydrogen liquefaction processes has been studied to increase the hydrogen liquefaction efficiency. For the current study hydrogen liquefaction process of 0.5 TPD capacity using He reversed Brayton cycle with LNG precooling was analyzed under restricted realistic conditions, resulting in the prediction of hydrogen liquefaction efficiency as s specific energy consumption.